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In these studies, cranial allometry was tested using a multivariate regression between shape (described using landmarks coordinates) and size (i.e. centroid size), after accounting for phylogenetic relatedness. Alternatively, cranial allometry can be determined by comparing the sizes of two anatomical parts using a bivariate regression analysis. In this analysis, a slope higher or lower than one indicates the existence of positive or negative allometry, respectively. Thus, in those species that support the <jats:styled-content style=\"fixed-case\">CREA<\/jats:styled-content> \u2018rule\u2019, positive allometry is expected for the association between face size and braincase size, which would indicate that larger species have disproportionally larger faces. In this study, I applied these two approaches to explore cranial allometry in 83 Galliformes (Aves, Galloanserae), ranging in mean body weight from 30\u00a0g to 2.5\u00a0kg. The multivariate regression between shape and centroid size revealed the existence of a significant allometric pattern resembling <jats:styled-content style=\"fixed-case\">CREA<\/jats:styled-content>, whereas the second analysis revealed a negative allometry for beak size and braincase size (i.e. contrary to the <jats:styled-content style=\"fixed-case\">CREA<\/jats:styled-content> \u2018rule\u2019, larger galliform species have disproportionally shorter beaks than smaller galliform species). This study suggests that the presence of <jats:styled-content style=\"fixed-case\">CREA<\/jats:styled-content> may be overestimated when using cranium size as the standard measurement.<\/jats:p>","DOI":"10.1111\/jeb.12918","type":"journal-article","created":{"date-parts":[[2016,6,16]],"date-time":"2016-06-16T08:19:08Z","timestamp":1466065148000},"page":"1873-1878","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":21,"title":["Testing the cranial evolutionary allometric \u2018rule\u2019 in Galliformes"],"prefix":"10.1093","volume":"29","author":[{"given":"M.","family":"Linde\u2010Medina","sequence":"first","affiliation":[{"name":"Faculty of Life Sciences University of Manchester Manchester UK"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"286","published-online":{"date-parts":[[2016,7,8]]},"reference":[{"key":"e_1_2_6_2_1","doi-asserted-by":"publisher","DOI":"10.1126\/science.6407108"},{"key":"e_1_2_6_3_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1469-7998.1985.tb04946.x"},{"key":"e_1_2_6_4_1","doi-asserted-by":"publisher","DOI":"10.1038\/nature11146"},{"key":"e_1_2_6_5_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1558-5646.1965.tb01720.x"},{"key":"e_1_2_6_6_1","doi-asserted-by":"publisher","DOI":"10.1073\/pnas.1602683113"},{"key":"e_1_2_6_7_1","doi-asserted-by":"publisher","DOI":"10.1038\/ncomms3458"},{"key":"e_1_2_6_8_1","doi-asserted-by":"publisher","DOI":"10.1007\/s11692-015-9308-9"},{"key":"e_1_2_6_9_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jtbi.2011.05.020"},{"key":"e_1_2_6_10_1","first-page":"384","volume-title":"The Skull. 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